Intake air temperature sensor`s location on sentra 2003 1.8 eng.

It's part of the MAF Sensor.

It should be f8 in the picture. Under the hood, driver side. Probably in air intake duct. F7 in the picture is the maf sensor. I circled f8 and f7. good luck.

Here's a link on your SENSOR. http://www.autozone.com/repairinfo/repairguide/repairGuideContent.jsp?fromSearchPage=true&pageId=0996b43f80378239&partName=Intake+Air+Temperature++IAT++Sensor&partId=0996b43f80378239

Location of Intake Air Temperature Sensor:
The intake air temperature sensor, which is mounted on the mass air flow meter, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature becomes low, the resistance of the thermistor increases When the temperature becomes high, the resistance drops .

Intake Air Temperature (IAT) Sensor: this sensor is located in the air intake plenum assembly. This sensor is combined with the MAF sensor.

Hope helps (remember to rating this free answer).

according to autozone.com, The Intake Air Temperature (IAT) Sensor is integrated with the Mass Air Flow (MAF) Sensor, and is located on the inboard side of the air cleaner housing (#1 below).

air intake look at snorkel it could be part of mass air flow check intake for eng coolant

the air intake sensor is a 2 wire sensor usually located in or close to the air cleaner

IT IS ON THE HOSE THAT BRINGS AIR INTO THE AIR FILTER HOUSING

if it cranks for a longer time than normal and than it starts, you my friend need a new fuel pump rebuild kit/pressure regulator inside the gas tank. what happens is that the fuel will go back into the gas tank instead of staying in the fuel line and everytime you turn the key, the pump has to pump fuel all the way to the injectors again to get the car started. So, long crank and than start means fuel pump rebuild kit/pressure regulator in tank.